<?php 
//////////////////////////////////////////////////
//
// a primitive high score manager in php
// (c) copyright 2007 javascriptgamer.com
//
// usage:
//
//    maintains a textfile containing $FILE_SIZE scores
//    returns an XML file with the top $LIST_SIZE scores
//    requires write access to $SCORE_FILE
//
//    Sanitizes incoming and outgoing data, but 
//    does NOT attempt to prevent cheating. 
//
//////////////////////////////////////////////////

$SCORE_FILE = "highscores.txt";
$FILE_SIZE = 100; // keep up to this many scores
$LIST_SIZE = 10;  // how many scores to return 

$OLD = "old";
$NEW = "new"; // marker for the new score in the list

// #### high scores ##############################

var SCORE_SCRIPT = 'highscores.php';


function get_scores() {
    new Ajax.Request(SCORE_SCRIPT, {
        method: 'get',
        onComplete: show_scores,
        onFailure: show_error
    });
}

var posted_scores     = false;
function post_score() {
    if (posted_scores) return; // prevent double post
    new Ajax.Request(SCORE_SCRIPT, {
        method: 'post',
        parameters: $H({
                        'name':  $F('player_name'),
                        'level': $F('player_level'),
                        'score': $F('player_score')
                    }).toQueryString(),
        onComplete: swap_scores,
        onFailure: show_error
    });
    posted_scores = true;
}


var low_high_score = 100;

function show_scores(req) {
    $('result').value = req.responseText;
    var scores = $A(req.responseXML.getElementsByTagName('score'));
    scores.each(function(node) {
        place = node.getAttribute('place');
        Element.update($('high_score_' + place), node.getAttribute('score'));
        Element.update($('high_name_' + place), node.getAttribute('name'));
        $('high_row_' + place).className = node.getAttribute('age'); // 'old' or 'new'
    });
    low_high_score = parseInt(scores[scores.length -1].getAttribute('score'));
}


function show_error(req){
    $('result').value = 'error';
}

/// read /////////////////////////////////////////
$scores = array();
$fp = fopen($SCORE_FILE, "r+"); 
$fp || die("couldn't open $SCORE_FILE");

// get an exclusive lock for writing
flock($fp, LOCK_EX);

// read the entire high score list
// each line contains: ip, level, score, name
// separated by spaces (name can contain extra spaces)
while (!feof($fp)) {
  list($ip, $level, $score, $name) = split(" ", rtrim(fgets($fp)), 4);
  // skip blank lines (including last newline)
  if (! $ip) continue;
  $level = 0 + $level;
  $score = 0 + $score;
  $scores[] = array($score, $level, $name, $ip, $OLD);
}

// show //////////////////////////////////////////

// now output the score list as xml

header("content-type: text/xml"); 

echo("<scores>\n"):

$count = 0; 
foreach ($scores as $index => $data) {
  if (++$count > $GLOBALS['LIST_SIZE']) break;
  list($score, $level, $name, $ip, $age) = $data;
  // escape HTML characters in names:
  // (we don't have to escape the other fields because
  // we ensured they were numbers before writing)
  $name = htmlentities($name, ENT_QUOTES);
  echo("<score place='$count' score='$score' level='$level' name='$name' age='$age'/>\n");
}
echo("</scores>\n");
?>

127.0.0.1 1 10 alice
127.0.0.1 1 9 bob
127.0.0.1 1 8 charlie
127.0.0.1 1 7 darla
127.0.0.1 1 6 eddie
127.0.0.1 1 5 flora
127.0.0.1 1 4 gabe
127.0.0.1 1 3 hannah
127.0.0.1 1 2 ian
127.0.0.1 1 1 jamie

var ENTER_NAME_SCREEN = Object.extend(new Screen('congrats'), {
    show : function () {
        Screen.prototype.show.call(this);
        $('player_name').focus();
    }
});

  <!-- enter your name screen -->
  <div id="congrats" class="overlay screen">
    <img src="../sprites/congrats.png" alt="congratulations!" />
  	<p>You made the High Score List! Enter Your Name!</p>
    <label>name
      <input type="text" id="player_name" name="player_name" />
      <input type="hidden" id="player_score" name="player_score" />
      <input type="hidden" id="player_level" name="player_level" />
    </label>
    <button onclick="post_score()">go</button>
  </div>

/// post /////////////////////////////////////////

// if new score is being posted
if ($_SERVER['REQUEST_METHOD'] == "POST") {

  // convert the level and score to numbers:
  $level = 0 + $_POST['level'];
  $score = 0 + $_POST['score'];
  
  // remove excess whitespace from the name 
  // (especially newlines, which would corrupt our file!)
  $name = implode(" ", preg_split("/\s+/", $_POST['name']));
  
  // now append the new score to the list
  $scores[] = array($score, $level, $name, $_SERVER['REMOTE_ADDR'], $NEW);


  // sort the merged list
  function with_high_scores_first($a, $b) {
    return -gmp_cmp($a[0], $b[0]);
  }
  usort($scores, "with_high_scores_first");
 
  // and write the list back to the file:
  fseek($fp, 0);	
  $count = 0;
  foreach ($scores as $index => $data) {
    if (++$count > $GLOBALS['FILE_SIZE']) break;
    list($score, $level, $name, $ip, $age) = $data;
    fwrite($fp, "$ip $level $score $name\n");
  }
}

// unlock and close the file
flock($fp, LOCK_UN);
fclose($fp);

var SCORES_SCREEN = Object.extend(new Screen('scores'), {
    show : function () {
        Screen.prototype.show.call(this);
        gameconsole.scheduleSwap(TITLE_SCREEN);
    },
    
    keyUp : TITLE_SCREEN.keyUp
});

#scoretable {
  width: 350px;
  margin:auto;
  margin-top: 5px;
  border-collapse:collapse;
  border: solid #666 3px;
}

#scoretable td {
  padding: 2px;
  background-color:#FFFFFF;
  border:none;
  height: 20px;
  text-align: left;
}

#scoretable tr.old {
  color: inherit;
}

#scoretable tr.new {
  color: #333333;
  font-weight:bold;
}

#scoretable td.score {
  text-align: right;
}

  <!-- high score screen -->
  <div id="scores" class="overlay screen">
    <img src="../sprites/highscores.png" alt="high scores" />
    <table id="scoretable" width="100%">
    </table>
    <script type="text/javascript">
    /* <![CDATA[ */
		for (i=1; i<=5; i++) {
			$('scoretable').innerHTML += (
			   '<tr id="high_row_' + i +  '" class="old">' +
			   '<td class="name" id="high_name_' + i + '"</td>'+
			   '<td class="score" id="high_score_' + i + '"</td>'+
			   '</tr>');
		}
    /* ]]> */
    </script>
    <p class="pressenter">press <strong>enter</strong> to start</p>
  </div>
  

function swap_scores(req) {
    show_scores(req);
    ENTER_NAME_SCREEN.hide();
    gameconsole.swap(SCORES_SCREEN);
}

	gameconsole.scheduleSwap(SCORES_SCREEN);